CN103858938A - Biological insecticide and preparation method thereof - Google Patents

Abstract

The invention relates to a biological insecticide. The biological insecticide is characterized by consisting of the following components in percentage by mass: 1.8-2.5 percent of bacillus thuringiensis, 6-8 percent of a solvent, 7-10 percent of an emulsifier, 5-10 percent of a dispersant, 0.4-1 percent of a thickening agent, 3-11 percent of an antifreeze agent and the balance being water. The biological insecticide disclosed by the invention has lower toxicity than an existing biological insecticide.

Description

Biological insecticides and preparation method thereof

Technical field

The present invention relates to field of biological pesticide, be specifically related to a kind of biological insecticides that contain bacillus thuringiensis,Bt and preparation method thereof.

Background technology

As everyone knows, insecticide, bactericide can be prevented and treated plant pest.In the last few years, due to a large amount of Synthetic Organic Chemistry agricultural chemicals that use, brought the series of problems such as well-known environmental pollution, ecological balance destruction and food security, and promotion agricultural economy had been realized to sustainable development and cause many adverse influences.

It is lower that biopesticide has toxicity, and selectivity is stronger, and the advantage such as be difficult for developing immunity to drugs, has been used widely in some fields at present, for example farm antibiotics, botanical pesticide, virus type agricultural chemicals etc.But current biopesticide, still has certain toxicity, and food security is threatened, how to make the lower or nontoxic research emphasis that has become pesticide field of the toxicity of biopesticide.

Summary of the invention

Main purpose of the present invention is to provide a kind of biological insecticides, is intended to reduce the toxicity of existing biological insecticides.

For realizing this object, the present invention has taked following technical scheme: a kind of biological insecticides, and its key is, these biological insecticides are composed of the following components by mass percentage:

Bacillus thuringiensis,Bt: 1.8%～2.5%;

Solvent: 6-8%;

Emulsifier: 7%～10%;

Dispersant: 5%～10%;

Thickener: 0.4%～1%;

Antifreeze: 3%～11%;

All the other are water.

Preferably, described solvent is ethanol, and its effective mass percentage is 6%-8%.

Preferably, described emulsifier is castor oil or fatty acid ethylene oxide adduct, and its effective mass percentage is 8%.

Preferably, described dispersant is calcium lignosulfonate or sodium lignin sulfonate, and its effective mass percentage is 8%-10%.

Preferably, described thickener is calcium carbonate or xanthans, and its effective mass percentage is 0.7%-0.9%.

Preferably, described antifreeze is urea, and its effective mass percentage is 5%-9%.

The present invention also provides a kind of process for preparing bio-insecticide, and its key is, comprises the following steps:

Bacillus thuringiensis,Bt is placed in to reactor, with ethanol dissolving, then adds emulsifier, mix and obtain oil mixture;

Water is placed in to another reactor, adds dispersant, thickener, antifreeze also mixes, and obtains aqueous mixture;

Oil mixture and aqueous mixture are mixed, stir 20 minutes to 40 minutes, can make biological insecticides.

The present invention has following characteristics:

1, biological insecticides of the present invention, substantially nontoxic to higher mammal, environmentally safe, is specially adapted to the control of pollution-free vegetable insect.

2, biological insecticides of the present invention, only to the sick worm of object and the minority organism effect that is closely related with it. and harmless to the mankind, birds, other insects and mammal.

3, biological insecticides of the present invention, low-residual, efficient, seldom the biological insecticides of amount can be brought into play high-effect effect, and it can decompose rapidly, avoid on the whole the problem of environmental pollution being brought by traditional agricultural chemicals.

4, biological insecticides of the present invention are difficult for developing immunity to drugs.

5, biological insecticides of the present invention can greatly reduce the use of traditional agricultural chemicals, do not affect crop yield simultaneously.

Embodiment

Composition and effect below in conjunction with specific embodiment to biological insecticides of the present invention are described further.

Embodiment 1

Each component is carried out to proportioning by following mass percent:

Bacillus thuringiensis,Bt: 2%; Ethanol: 8%; Castor oil: 8%; Calcium lignosulfonate: 7%; Calcium carbonate: 0.4%; Urea: 9%; All the other are water.

Bacillus thuringiensis,Bt is placed in to reactor, with ethanol dissolving, then adds castor oil, mix and obtain oil mixture; Water is placed in to another reactor, adds calcium lignosulfonate, calcium carbonate, urea also mixes, and obtains aqueous mixture; Oil mixture and aqueous mixture are mixed, stir about 30 minutes, can make biological insecticides.

Embodiment 2

Each component is carried out to proportioning by following mass percent:

Bacillus thuringiensis,Bt: 1.8%; Ethanol: 6%; Castor oil: 7%; Calcium lignosulfonate: 6%; Calcium carbonate: 1%; Urea: 5%; All the other are water.

Bacillus thuringiensis,Bt is placed in to reactor, with ethanol dissolving, then adds castor oil, mix and obtain oil mixture; Water is placed in to another reactor, adds calcium lignosulfonate, calcium carbonate, urea also mixes, and obtains aqueous mixture; Oil mixture and aqueous mixture are mixed, stir the biological insecticides that can make about 0.5 hour.

Embodiment 3

Each component is carried out to proportioning by following mass percent:

Bacillus thuringiensis,Bt: 2.5%; Ethanol: 7%; Castor oil: 9%; Calcium lignosulfonate: 8%; Calcium carbonate: 0.7%; Urea: 10%; All the other are water.

Bacillus thuringiensis,Bt is placed in to reactor, with ethanol dissolving, then adds castor oil, mix and obtain oil mixture; Water is placed in to another reactor, adds calcium lignosulfonate, calcium carbonate, urea also mixes, and obtains aqueous mixture; Oil mixture and aqueous mixture are mixed, stir the biological insecticides that can make about 0.5 hour.

Embodiment 4

Each component is carried out to proportioning by following mass percent:

Bacillus thuringiensis,Bt: 2%; Ethanol: 8%; Castor oil: 8%; Calcium lignosulfonate: 10%; Xanthans: 0.8%; Urea: 9%; All the other are water.

Bacillus thuringiensis,Bt is placed in to reactor, with ethanol dissolving, then adds castor oil, mix and obtain oil mixture; Water is placed in to another reactor, adds calcium lignosulfonate, xanthans, urea also mixes, and obtains aqueous mixture; Oil mixture and aqueous mixture are mixed, stir the biological insecticides that can make about 0.5 hour.

The application of biological insecticides prepared by embodiment 1-4

These biological insecticides, wherein contained toxalbumin can be decomposed into poisonous polypeptide in insect body, and these polypeptide can combine with some special receptor proteins of worm epigaster chrotoplast, destroy cell membrane, finally cause polypide death.

This insecticide is to lepidoptera pest, as diamond-back moth, and cabbage caterpillar, cotton bollworm, oriental tobacco budworm, rice plant skipper, corn borer, the snout moth's larva of rice, fall webworm, Yangzhou moth, the various pests such as pine caterpillars have good preventive and therapeutic effect.

The field trial of now preventing and treating cotton bollworm take the biological insecticides of preparation in case study on implementation 1 as example.

Experiment condition:

1, crop and subjects:

Crop: cotton; Experimental subjects: cotton bollworm.

2, environmental condition:

This experiment is located at our company experimental field, and planting density is every mu of 3000 strains, and experimental period is cotton bud stage, and cotton bollworm is advisable with 2-3 age, and soil property is loessland.

Experimental scheme and arrangement:

Reagent agent is the insecticide containing 2% bacillus thuringiensis,Bt.

Chemicals treatment:

1) the 200 grams/667m2 of insecticide of 2% bacillus thuringiensis,Bt

2) the 250 grams/667m2 of insecticide of 2% bacillus thuringiensis,Bt

3) the 300 grams/667m2 of insecticide of 2% bacillus thuringiensis,Bt

4) clear water contrast.

3, application method: adopt spraying evenly to spray.

4, experimental result

The foregoing is only the preferred embodiments of the present invention; not thereby limit its scope of the claims; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention to do, is directly or indirectly used in other relevant technical fields, is all in like manner included in scope of patent protection of the present invention.

Claims (7)

1. biological insecticides, is characterized in that, these biological insecticides are composed of the following components by mass percentage:

Bacillus thuringiensis,Bt: 1.8%～2.5%;

Solvent: 6～8%;

Emulsifier: 7%～10%;

Dispersant: 5%～10%;

Thickener: 0.4%～1%;

Antifreeze: 3%～11%;

All the other are water.

2. biological insecticides according to claim 1, is characterized in that, described solvent is ethanol, and its effective mass percentage is 6%～8%.

3. biological insecticides according to claim 1, is characterized in that, described emulsifier is castor oil or fatty acid ethylene oxide adduct, and its effective mass percentage is 8%.

4. biological insecticides according to claim 1, is characterized in that, described dispersant is calcium lignosulfonate or sodium lignin sulfonate, and its effective mass percentage is 8%～10%.

5. biological insecticides according to claim 1, is characterized in that, described thickener is calcium carbonate or xanthans, and its effective mass percentage is 0.7%～0.9%.

6. biological insecticides according to claim 1, is characterized in that, described antifreeze is urea, and its effective mass percentage is 5%～9%.

7. process for preparing bio-insecticide as claimed in claim 1, is characterized in that, comprises the following steps:

Bacillus thuringiensis,Bt is placed in to reactor, after fully dissolving with ethanol, adds emulsifier, mix and obtain oil mixture;

Water is placed in to another reactor, adds dispersant, thickener, antifreeze also mixes, and obtains aqueous mixture;

Oil mixture and aqueous mixture are mixed, stir 20 minutes to 40 minutes to fully dissolving, can make biological insecticides.